Pressure gun for the application of heavy asphalt fibered mastic



Fab, 5; 1935. R KELLEY 1,989,696

PRESSURE GUN FOR THE APPLICATION OF HEAVY ASPHALT FIBERED MASTIC FiledJuly 18, 1931 0 i 7 14: L) 1/1 1g IN VENT OR G f Fo u A YTORNEKSPatented F al). 5, 1935 PRESSURE GUN FOR THE APPLICATION OF HEAVYASPHALT FIBERED MASTIC Raymond E. Kelley, Snyder, N. Y., assignor toHelene T. Kelley, Snyder, N. Y.

Application July 18, 1931, Serial No. 551,613

1 Claim.

This invention relates to a pressure gun for the application of heavyasphalt fibered mastic. Heretofore many types of pressure guns for theapplication of liquid compounds such as asphalts,

paint and even cement concrete and lime mortar and the like have beendeveloped and used for coating surfaces with such materials, suchmaterials serving to water-proof and damp-proof the surfaces to whichthey are applied and in some instances also to provide a surface towhich plaster could be applied.

There is a class of asphalt fibered mastic materials, however, whichhave never been attempted to be applied by means of a pressure gun andno pressure gun has ever been devised which will apply such materials.This material is a heavy asphalt mastic which is extremely viscous andvery difiicult to stir and must be shoveled from the steel drum into thepressure tank and which additionally contains a large amount of asbestosfibers, slate flour and fine sand. Such fiber mastic is applied toconcrete or masonry structures or the like in a layer of substantialthickness in one operation or one coat and heretofore has been troweledon. Such troweling is, of course, not uniform in thickness and is alaborious and expensive method of applying this material as comparedwith a gun application such as proposed by the present invention.

The present invention relates exclusively to a pressure gun for theapplication of heavy asphalt fibered mastics and has no relation topressure guns for the application of liquid compounds or liquid asphaltsor other materials concerning which there has been no difliculty.

In the accompanying drawing:

Fig. 1 is a longitudinal section through a pres sure gun for theapplication of heavy asphalt fibered mastic.

Fig. 2 is a longitudinal section through such a gun taken on line 2-2,Fig. 1.

Fig. 3 is a transverse section taken on line 3-3, Fig. 1.

The gun shown in the accompanying drawing comprises a cylindrical body 5which is closed at one end and at its closed end is provided with anaxial threaded hole 6. The opposite end of the body 5 is open and isformed to provide a reduced externally threaded neck '7. Within the body5 and projecting outwardly from the open end thereof is a hollowstem 8.This stem is threaded at one end as indicated at 9 and is provided withan enlarged shoulder 10 and a washer 11. This stem is screwed into thethreaded opening 6 in the body and the washer 11 is tightened betweenthe shoulder 10 and the end of the body 5 so that a tight joint isobtained between the interior of the hollow body 5 and the opening 6.The opposite end of the hollow stem 9 projects out through the open endof the body 5 and is enlarged and formed to provide a conical tip 12.This tip 12 is adapted to form a regulating seat for the conical end 13of a nozzle 14. This nozzle screws over the exterior of the neck '7 andis held in its adjusted position by a lock nut 15. The nozzle 14 isprovided with the usual opening through which the end of the stem 8projects and its outer surface is preferably milled or roughened so thatthe nozzle can be turned to adjust its position relative to the conicaltip 12 of the stem 8. This adjustment effects the spread of the spray ofmastic.

The mastic is introduced under air pressure from a mastic supply line 16which is connected to a fitting 17 this fitting screwing into thethreaded opening 6. The air under pressure to spray the mastic isintroduced from an air supply line 18 which screws into a boss 19 in theside of the gun. In using the gun the mastic is forced under airpressure from the supply line through the 45 elbow fitting 17, threadedopening 6 into the stem 8 and issues from the conical tip 12 of thestem. As it issues it is caught by the circular stream of air from theair supply line 18, interior of the hollow body 5 and flowing throughthe nozzle 14, and the stream of mastic from the tip of the stem 8 isbroken up into fine particles or a spread stream and will cover a largearea of the surface to which it is to be applied. The spread of thestream is adjusted by means of the nozzle 14, the unscrewing of thisnozzle 14 reducing the area or spread of the stream and screwing it downincreasing the area or spread of the stream.

A mastic gun such as above described has been found to be entirelysatisfactory in the application of heavy asphalt fibered mastics andentirely eliminates the hand troweling which has been heretoforenecessary in the application of this form of surfacing.

I claim as my invention:

A pressure gun for the application of plastic materials, comprising ahollow body having a mouth at one end and a uniformly threaded openingthrough its opposite end substantially coaxial with said mouth, arelatively large open ended tubular stem having an enlarged head at oneend and being externally threaded at its opposite end, an externalcollar at the threaded end of said stem, said stem being adapted to beinserted through the mouth of said hollow body and screwed into saidthreaded opening. said collar forming a tight seal for the threadedjoint so formed between said stem and body. a supply pipe for theplastic materials also screwed into said 5: threaded opening from theoutside of said body,

a nozzle having a screw connection with said body and closing saidmouth, said nozzle having a discharge opening smaller than the head oi!said stem and cooperating therewith. and means for forcing air underpressure into said body exteriorly or said stem, the said air issuingfrom the discharge opening in said nozzle spreading the material issuingfrom said head to provide a spray of said materials.

RAYMGND E. KELLEY.

